JP3841800B2 - Film-based liquid leak sensor and method for producing the same - Google Patents

Description

  The present invention relates to a liquid leakage sensor that detects liquid leakage such as dialysis, drip, and filth and informs a supporter such as a nurse, and a method for producing the same.

  Conventionally, water-absorbing materials such as cloth or paper have been used as a urine test device to detect the urination of infants and elderly people who need nursing care, and to notify this to other people such as nurses. A detection unit in which a pair of conductive wires are arranged in parallel at a predetermined interval on the surface or inside of the body, and a notification lamp is turned on or a notification buzzer is sounded according to the conduction between the conductive wires by urine The device has been put into practical use.

However, since this apparatus has a slight decrease in electrical resistance between the electrodes due to wetness of the water-absorbing material, it is necessary to increase the voltage, and since this increases the risk, various improvements have been added thereafter. To make sure that electricity flows between the electrodes when it is wetted with urine by drying a paper that is sprayed with water or dipped in parallel paper with two papers soaked in a predetermined concentration of saline, There has been proposed a urine detection unit and the like that improve the urine detection performance and make it possible to set a low voltage to be applied between the electrodes. (For example, see Patent Document 1)
However, each of the above urine detection devices is mainly intended to detect urination of infants and elderly people requiring nursing care, and hardly discloses dialysis or drip liquid leakage. In general, dialysis or drip liquid leakage is generally laminated. Only silver-based squares printed on paper were used.

  In addition, the above-mentioned sensor using laminated paper is silver-based, and thus has a problem that it is expensive and not suitable for mass production.

Therefore, the present inventor dealt with the actual situation as described above, and in particular, finds a combination of an aluminum foil and a film via a UV reducer (ultraviolet ray absorption curable ink) to synthesize it as a liquid leak sensor during dialysis and infusion. A circuit pattern is formed on the resin film with an aluminum foil that is closely adhered and fixed with UV reducer (ultraviolet ray absorption curable ink) as glue, and salt content is included on the upper surface via a star-shaped dot surface printed with a UV reducer. A sensor was proposed in which starch paste was pattern-printed and the pattern printing was covered with a paper towel through thin paper. (Japanese Patent Application No. 2004-68823)
Japanese Patent No. 3274130

  However, in the sensor according to the above proposal, since the starch paste containing salt is printed on the pattern, the salt mixed paste sticks to the aluminum circuit, and when the aluminum circuit is energized, the salt is charged with electricity and stored, and the voltage drops. As a result, it has been found that the detection function is not sufficient and the stability of the operation of the alarm by voltage sensing is impaired.

  Moreover, since it contains salt, there was a concern that when it comes into contact with aluminum, the aluminum would corrode.

  In order to cope with the actual situation as described above, the present invention improves the previously proposed sensor, and in particular, by separating the salinity and the aluminum circuit in the starch layer, avoiding malfunction of the aluminum circuit sensor and salinity due to long-term energization. The purpose is to prevent malfunctions for power storage and to detect liquid leakage during dialysis and infusion with high accuracy.

That is, the liquid leakage sensor of the present invention for achieving the above object has a circuit pattern of an aluminum foil that is closely fixed to a synthetic resin film with a UV reducer as a glue, and the circuit pattern is a resistance by graphite in the circuit. Part is formed, and the starch layer of salt paper with salt layer sandwiched between starch and paper is held and integrated on the upper surface via black dot pattern glue, and the starch layer separates salt and aluminum circuit In addition, this is a film-based liquid leak sensor in which a protective cloth such as a nonwoven fabric or a paper towel is attached to the paper surface.

  According to a second aspect of the present invention, there is provided a film-based liquid leakage sensor characterized in that a terminal connection portion of the circuit pattern and a resistance portion made of graphite are provided on the upper and lower sides, and a notch is formed in the terminal connection portion so is there.

Further, claim 3 is a method for producing the sensor, wherein the synthetic resin film is subjected to corona treatment, and a UV reducer is offset printed with a plate having a circuit pattern, and an aluminum foil is immediately brought into close contact with the film. UV irradiation from the side, the process of fixing the pattern using UV reducer as glue, the outer periphery of the circuit is cut, the parts other than the circuit are peeled off, the excess aluminum foil is recovered, the resistance part in the circuit on the film This is a process of pad printing graphite with urethane solvent, adding salt water to bulky thin paper, drying to form salt paper, pressing semi-dry starch on the salty surface, and salting with starch and paper Form the paper with the layers sandwiched, hold the starch layer on the circuit surface on the film and integrate with dot pattern glue and protect the salt from seeping out on the thin paper surface To do Nonwoven, paper towels, etc., characterized by comprising from each step of the process of bonding cut finished with a protective cloth and a dot pattern glue.

  A fourth aspect of the present invention is characterized in that, in the above preparation method, after cutting and finishing, further sterilized by ultraviolet rays or infrared rays and hermetically sealed.

  Thus, the above solution means that the film and the aluminum foil can be instantly dried and fixed by curing the UV reducer that has become paste-like by UV irradiation, by using the UV reducer. Adhesives enter each other due to the corrugation caused by the corona treatment, further enhancing the adhesion.

  Also, by holding the starch paste of the paper with the salt layer sandwiched between the starch and paper through the star-shaped dot printing surface, the thickness of the starch paste layer can be made uniform and the adhesive strength is increased. be able to.

  Furthermore, since the starch layer separates the salinity and the aluminum circuit, the starch layer does not send electricity to the salt layer, and therefore no electricity is stored in the salt layer, so the set current flows and the voltage becomes constant. When the starch enters the water and the salt layer dissolves, the set current flows to prevent the malfunction of the aluminum sensor and the malfunction of the salt layer due to power storage, and the liquid leakage can be detected accurately and accurately.

  In addition, the starch layer separates the salinity and the aluminum circuit, so that it does not sense air humidity or a small amount of sweat and reacts only to a large amount of moisture of 1 cc or more.

  According to the second aspect of the present invention, it is possible to set both in parallel and perpendicular to the arm by making the incision and the graphite printing up and down, and it is possible to make a left-right difference.

  Furthermore, by covering with a paper towel or the like, the leaked blood spreads and improves the sensing efficiency, and prevents the salt from seeping out on the surface of the thin paper and deteriorating the skin.

  As described above, the present invention uses a UV reducer as a paste, performs star-shaped dot printing to retain the starch layer, and further prints graphite on the resistance portion and energizes it, thereby increasing the thickness of the starch layer. The uniformity of the thickness is achieved, and the accuracy of detecting the leakage of liquid or blood during dialysis and infusion is improved, and in particular, salt paper with a salt layer sandwiched between starch paper is used. Therefore, the malfunction of the aluminum sensor can be avoided, the malfunction for storing the salinity due to long-term energization can be prevented, and the detection effect can be further enhanced.

  In addition, the film and aluminum foil can be easily combined at a low cost with a remarkable effect that enables mass production.

  Embodiments of the present invention will be described below with reference to FIGS.

  1 to 3 sequentially show a method for producing a sensor according to the present invention.

  First, in the production of the sensor according to the present invention, the corona treatment is applied to the synthetic resin film 1 such as PET and PP shown in FIG. 1, and the UV reducer is offset printed with the plate having the circuit pattern, and the aluminum is immediately applied to the surface. The foil 2 is brought into close contact with each other, and the pattern is fixed by irradiating ultraviolet rays from the film side, using the UV reducer as a paste.

  The UV reducer is a kind of ultraviolet absorption curable ink, which is cured by irradiation with ultraviolet rays and fixed in an instant.

  At this time, a slight unevenness enters the surface of the aluminum foil and hardens, thereby improving the adhesiveness.

  Next, the outer periphery of the circuit is half-cut with a die-cut roll blade, and the part other than the circuit is peeled off with air, and the excess aluminum foil is recovered and recycled. Send to processing.

  The film 1 and the aluminum foil 2 from which parts other than the circuit have been peeled off are put in the circuit of the film as a resistance part 3, and the graphite is put printed with urethane solvent in order to notify the voltage shortage (resistance stability and avoidance of cutting) ) Or oil-based graphite mixed with UV ink is offset printed and energized, and an L-shaped cut 4 ′ for facilitating connection of the sensor terminal 4 from either the vertical or horizontal direction is put in the film.

  As described above, when the above operation is completed, a sensor body for reacting the liquid content is formed. Then, a half-dried starch is pressure-bonded to paper 5 to make paper 5 with a salt layer sandwiched between starch and paper.

  Then, in order to increase the adhesive force and make the thickness uniform, the star-shaped dot printing with corners shown in FIG. 2 is performed, and the salt paper is fixedly held on the film with the dot pattern paste 6.

  Star-shaped dot printing is suitable for increasing the adhesive force and making the thickness of the paste layer uniform by holding the starch layer when the pressure is applied from above, and retaining the starch layer.

  The use of salt paper with a salt layer sandwiched between starch and paper is to separate the salinity from the aluminum circuit in the starch layer, thereby avoiding malfunction due to aluminum corrosion caused by contact between the aluminum sensor and the salt. In addition, it is effective in preventing malfunction due to current instability and voltage drop due to salt storage.

The salt content for forming the salt paper can usually use a salt solution, and the adhesion can be performed by immersing the thin paper in the salt solution or spraying it. After fixing the paper on the film, a thin paper that is excellent in water absorption and hard to tear, such as Japanese paper, is pasted and dried at a high temperature, but the non-woven fabric, paper towel, etc. that are soft to the touch because it oozes on the surface of the thin paper. When the protective cloth 7 made of the flexible water-absorbing material is made slightly larger than the film, it is attached to the portion in contact with the arm using a pattern glue or other glue, and finished by cutting.

  In addition, it is preferable to pull out the circumference into a large corrugated shape so as not to cut the hand with the nonwoven fabric.

  The resulting film and aluminum foil sensor is then sterilized with ultraviolet or infrared light, hermetically sealed, and completed.

  The sensor completed as described above finally has a circuit pattern made of aluminum foil 2 which is closely fixed to the synthetic resin film 1 using a UV reducer as a glue, and the pattern is oily in the circuit. A resistance portion 3 made of graphite is formed, and a salt paper 5 in which a salt layer is sandwiched between starch and paper is fixed and integrated through a star-shaped dot surface 6 printed with a UV reducer on the upper surface, And this pattern printing becomes a structure covered with the paper towel through the thin paper.

  The sensor thus obtained uses a salt paper in which a salt layer is sandwiched between starch and paper when leakage occurs in dialysis, drip, etc. by connecting the terminal 4 to a notification section (not shown). When the starch and the salt layer are melted and sensed, the voltage applied through the resistance portion 3 is lowered to notify the notifying unit to turn on the lamp or sound a buzzer.

  When connecting the terminals, the alligator's mouth can be set either parallel or perpendicular to the arm, so that the terminals do not touch the skin.

It is a fixed state figure of the film and aluminum foil at the time of preparation by this invention. It is a figure which shows the state which performed dot printing on the film upper surface. It is the state figure which bonded the paper towel.

Explanation of symbols

1: Film 2: Aluminum foil 3: Resistance part 4: Terminal 5: Salt paper 6: Dot part 7: Paper towel (protective cloth)

Claims (4)

It has a circuit pattern made of aluminum foil that is closely fixed to the synthetic resin film using UV reducer as a glue. This pattern has a resistance part made of graphite in the circuit, and a star-shaped dot pattern glue on its upper surface. The starch layer of salt paper with the salt layer sandwiched between starch and paper is held and integrated, and the starch layer separates the salt content from the aluminum circuit, and a protective cloth such as nonwoven fabric and paper towel is attached to the paper surface. A film-based liquid leak sensor.   The film-based liquid leakage sensor according to claim 1, wherein a terminal connection portion of the circuit pattern and a resistance portion made of graphite are provided on the upper and lower sides, and a cut is formed in the terminal connection portion. A corona treatment is applied to a synthetic resin film, and a UV reducer is offset printed with a plate made with a circuit pattern. Immediately after that, an aluminum foil is brought into close contact with the surface, UV irradiation is performed from the film side, and a pattern is formed using the UV reducer as a paste. The step of fixing, cutting the outer periphery of the circuit, peeling off the part other than the circuit, collecting the excess aluminum foil, forming the resistance part in the circuit on the film by pad printing with urethane solvent, with a saline bulky thin paper and dried to form a salt paper, to form a paper across the salt layer with starch and paper crimp the semidry starch large faces of salt, the the paper Dottopa nonwoven, such as paper towels, a protective cloth in order to protect the step of integrating the starch layer with a dot pattern glue to hold on to the circuit surface of the film, and salt comes out stain on thin paper surface Preparation method of the film-based liquid leakage sensor, characterized in that consists of the steps of the step of cutting finishing stick in over down glue.   4. The method for producing a film-based liquid leakage sensor according to claim 3, wherein the protective cloth is pasted with a dot pattern paste, cut and finished, sterilized with ultraviolet rays or infrared rays, and hermetically sealed.